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Find out about categories in the categories table but NOT in the nested tree model. This is probably pretty harmless (unless you appear to be mmissing categories all of a sudden) but can cause 3.x versions of FarCry to fail when trying to render the category picker.

SELECT c.*
FROM categories c
WHERE 
categoryid NOT IN (SELECT objectid FROM nested_tree_objects)

Then decide what you want to do with any category items that appear. You could reattach them to the tree if there is something categoriesd to these category items.

SELECT * FROM refcategories
WHERE categoryid IN 
	(SELECT categoryid
	FROM categories
	WHERE 
	categoryid NOT IN 
		(SELECT objectid FROM nested_tree_objects))

or just delete them if they sem to be harmless enough.

DELETE
FROM categories c
WHERE 
categoryid NOT IN (SELECT objectid FROM nested_tree_objects)

However, you may have some orphaned categories in the nested tree model. ie those category references that have lost their parent (maybe through a deletion that didn't finish properly). You can grab a list of orphaned nested tree references using the following:

SELECT *
FROM nested_tree_objects
WHERE 
parentid NOT IN (SELECT objectid FROM nested_tree_objects)
AND parentid <> ''

Rather than deleting everything you could just find the object references a new parent!

UPDATE nested_tree_objects
SET
parentid='--some UUID of valid parent--'
WHERE
objectid IN (select objectid from nested_tree_objects
		where 
		parentid NOT IN (select objectid from nested_tree_objects))
		AND (parentid is not null or parentid <> '')